KR102309153B1 - Precision grinder on stop seal and grinding method - Google Patents

Abstract

The present invention relates to a stop seal surface precision polishing device and a polishing method. The stop seal surface precision polishing device according to one embodiment of the present invention is the stop seal surface precision polishing device which is provided to process a damaged spherical surface on the surface of a stop seal of a coolant pump spindle of a nuclear reactor, and comprises: a base plate installed on a bottom surface; a spindle rotation support module installed at the upper portion of the base plate to support the rotation of the coolant pump spindle; a spindle driving module installed at the distal end portion of one side of the upper portion of the base plate to rotate the coolant pump spindle; a first LM guide installed in the X-axis direction of the base plate; a moving table movably installed in the X-axis direction of the base plate along the first LM guide, and installed to be relatively higher than the stop seal; a tool stand rotating module rotationally installed at the upper portion of the moving table; a lower portion support plate fixedly installed at the upper portion of the tool stand rotating module; a second LM guide installed in the Y direction of the base plate at the upper portion of the lower portion support plate; a transport tool stand movably installed in the Y-axis direction of the base plate along the second LM guide; and a cutting tool clamp installed at the upper portion of the transport tool stand so as to clamp a cutting tool.

Description

Precision grinder on stop seal and grinding method

The present invention relates to a stop seal surface precision polishing apparatus and a polishing method for precisely polishing the stop seal surface of a nuclear reactor coolant pump shaft, and more particularly, to a coolant pump shaft of a nuclear reactor, which is a contaminated high-pollution component, without taking it out of a maintenance site It relates to a surface precision polishing apparatus and a polishing method of a stop seal that can grind and polish the stop seal surface with precise shape and precision machining by moving freely at a maintenance site within a radiation zone.

In general, a reactor coolant pump (RCP) is installed on the primary side of the nuclear steam supply system (NSSS) of a nuclear power plant, and it circulates the reactor coolant forcibly to remove heat generated from nuclear fuel. It is a device that transmits to the secondary side of the steam generator (SG), and a sealing device is installed in the coolant pump (RCP) to prevent leakage of the primary side flow heated in the reactor to the outside.

The coolant pump shaft rotates the impeller by receiving the rotational force of the drive motor, and the stop seal coupled to the coolant pump shaft is seated on the bearing sleeve during disassembly and assembly to prevent the reactor coolant from flowing out in the direction of the stop seal is performing

The complete disassembly and inspection cycle of the reactor coolant pump is defined as 10 years. When the coolant pump is completely disassembled, the stop seal is usually removed from the coolant pump shaft to inspect the coolant pump shaft and the assembly surface of the stop seal for defects. and a separate non-destructive inspection is performed on the assembly surface.

Most of the methods to remove the stop seal from the coolant pump shaft are to install the coolant pump shaft on a milling machine, cut and disassemble the stop seal with an end mill, and heat a new stop seal to shrink the coolant pump shaft when assembling the stop seal. When the stop seal is removed from the coolant pump shaft as above, the assembly face of the coolant pump shaft assembled with the stop seal is removed by grinding very carefully to maintain a very important surface so that any small damage to the surface is not allowed. .

The nuclear power plant replaces the sealing device of the reactor coolant pump during the planned prevention period. At this time, if the reactor coolant flows into the seal housing where the sealing device is installed, it is impossible to replace the sealing device, so the inflow of the reactor coolant into the seal housing is blocked. A stop seal is installed on the coolant pump shaft, which functions like a valve.

The reactor coolant pump is a vertical pump, and in order to replace the sealing device, the coupling installed on the top of the sealing device must be removed. ), the stop seal contacts the bearing sleeve and closes the valve to block leakage.

The material of the stop seal is ASME SA-473 Type 431, and it is installed without heat treatment and the surface may be damaged due to slight handling carelessness, which may cause leakage after the stop seal comes into contact with the bearing sleeve.

During the complete disassembly and maintenance of the reactor coolant pump, the damaged surface of the stop seal is manually wrapped, but the stop seal surface is machined into a spherical surface with a radius of 155 mm, so it is difficult to process it into an accurate shape by manual lapping. The reactor coolant pump maintenance performed during the preventive maintenance period is performed as a major process, so depending on the degree of damage to the stop seal, if a lot of machining time is consumed, the process may be delayed, and if the machining of the damaged surface of the stop seal is wrong, the stop seal Leakage of reactor coolant may occur after installation.

For the damaged part of the stop seal surface, precise processing is required to suit the shape and surface roughness of the design requirements. The investment amount is too large, and the coolant pump shaft is a highly polluted part contaminated with radiation, so it cannot be taken out of the maintenance site and processed by CNC equipment.

Therefore, it is urgently required to develop a stop seal processing device and a processing method that can grind and polish the stop seal surface at the maintenance site as a portable processing equipment capable of accurate shape and precise processing.

Domestic Patent Publication No. 10-2010-0060129 (Ultrasound inspection method and apparatus of hollow shaft assembly surface) (published on June 07, 2010)

The present invention was invented to improve the above problems, and the first problem to be solved by the present invention is to not take out the coolant pump shaft of the nuclear reactor, which is a highly contaminated component with radioactive material, to the outside of the maintenance site. It is to provide a surface precision polishing apparatus and polishing method of a stop seal that can move freely in the stop seal surface and grind and polish the stop seal surface with precise shape and precision machining.

In addition, the second problem to be solved by the present invention is that the damaged surface processing of the stop seal can be completed within a short time, so that the input manpower can be greatly reduced, and the maintenance quality can be improved by improving the precision of the processing surface through machining. Another object of the present invention is to provide a surface precision polishing apparatus and polishing method for a stop seal capable of preventing a delay in the maintenance of a reactor coolant pump performed as a main process during a planned preventive maintenance period for a nuclear power plant.

The technical problem of the present invention is not limited to those mentioned above, and another technical problem not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an apparatus for precision polishing the surface of a stop seal according to an embodiment of the present invention is an apparatus for precision polishing the surface of a stop seal for processing a damaged spherical surface on the surface of the stop seal of a coolant pump shaft of a nuclear reactor, a base plate installed on the floor; a shaft rotation support module installed on the base plate to support rotation of the coolant pump shaft; a shaft driving module installed at an upper end of the base plate to rotate the coolant pump shaft; a first LM guide installed in the X-axis direction of the base plate; a moving table installed movably in the X-axis direction of the base plate along the first LM guide and installed relatively higher than the stop seal; a tool rest rotation module rotatably installed on the upper portion of the moving table; a lower support plate fixedly installed on the top of the tool rest rotation module; a second LM guide installed on the upper part of the lower support plate in the Y direction of the base plate; a transfer tool rest installed movably in the Y-axis direction of the base plate along the second LM guide; and a cutting tool clamp installed on the upper portion of the transfer tool rest to clamp the cutting tool.

In this case, the shaft rotation support module may include: side brackets installed on the upper surface of the base plate at a predetermined distance from each other; a bearing fixing bracket fixed to the side bracket; a bearing fixing plate supported by the bearing fixing bracket; and a ball bearing installed on the bearing fixing plate and in contact with an outer circumferential surface of the coolant pump shaft.

In addition, the shaft driving module may include a fixing bracket that is fixedly installed on the base plate; a reducer installed on the upper part of the fixing bracket; a shaft drive motor connected to the reduction gear and generating power; a coolant pump shaft bracket detachably installed with a bolt at one end of the coolant pump shaft; a shaft installed concentrically with the coolant pump shaft at the center of the coolant pump shaft bracket; a coupling connecting the shaft and the reducer to each other to rotate the coolant pump shaft; and a bearing part supporting the shaft.

In addition, the tool rest rotation module is characterized in that the knurling handle is installed on the side.

In addition, the first LM guide is provided with a first position fixing clamp for fixing the movement position of the moving table, and the lower support plate is provided with a second position fixing clamp for fixing the movement position of the transfer tool rest. characterized.

In addition, the moving table, a flange connected to the first LM guide to move along the first LM guide; a leg installed above the flange and installed relatively higher than the stop seal; and a flat plate which is formed horizontally on the leg and rotatably installed on the tool rest rotation module.

The shaft rotation support module may support the coolant pump shaft so that the coolant pump shaft can be rotated even if the center of the shaft driving module is misaligned.

On the other hand, in order to achieve the above object, a method for precision polishing the surface of a stop seal according to an embodiment of the present invention is a method for precision polishing the surface of a stop seal for processing a damaged spherical surface on the surface of the stop seal of a coolant pump shaft of a nuclear reactor. a first step of rotatably installing the coolant pump shaft on a shaft rotation support module; a second step of connecting the coolant pump shaft to a shaft drive module; The moving table is moved along the first LM guide in the X-axis direction and the position is fixed, and the feed tool rest is moved in the Y-axis direction along the second LM guide to fix the position, and then the cutting tool is brought into contact with the machining surface of the stop seal. a third step of letting; a fourth step of driving the shaft driving module to rotate the coolant pump shaft and driving the cutting tool; and a fifth step of machining the damaged spherical surface on the surface of the stop seal while adjusting the cutting depth of the cutting tool installed on the transfer tool rest by turning the knurling handle of the tool rest rotation module. .

In this case, the fifth step is characterized in that the convex spherical surface of the stop seal is processed using any one of a grinding wheel, a diamond lapping wheel, or a diamond lapping film according to the degree of surface damage of the stop seal.

Also, in the fifth step, the grinding wheel, the diamond lapping wheel, or the diamond lapping film are sequentially processed to satisfy the final surface roughness.

The details of other embodiments are included in the detailed description and drawings.

According to the surface precision polishing apparatus and polishing method of the stop seal according to an embodiment of the present invention, since the stop seal can be spherically machined into an accurately designed spherical shape, thereby improving the maintenance quality, the stop seal of the conventional reactor coolant pump is Since manual lapping is performed every time the pump is disassembled and maintained, the problem that the spherical surface of the stop seal cannot be processed into an accurate shape can be solved.

In addition, according to the surface precision polishing apparatus and polishing method of the stop seal according to an embodiment of the present invention, it is possible to significantly reduce the input manpower by completing the machining of the damaged surface of the stop seal within a short time, and by machining the surface of the machined surface It is possible to improve the quality of maintenance by improving the precision, and it is possible to prevent the process delay of the maintenance of the coolant pump of the reactor, which is performed as the main process during the planned preventive maintenance period of the nuclear power plant.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a front view showing the structure of a surface precision polishing apparatus of a stop seal according to an embodiment of the present invention.
2 is a left side view showing the structure of a surface precision polishing apparatus of a stop seal according to an embodiment of the present invention.
3 is a plan view showing the structure of a surface precision polishing apparatus of a stop seal according to an embodiment of the present invention.
4 is an excerpt of the main part of the surface precision polishing apparatus of the stop seal shown in FIG. 1 .
5 is an excerpt of the main part of the surface precision polishing apparatus of the stop seal shown in FIG.
6 is an excerpt of the main part of the surface precision polishing apparatus of the stop seal shown in FIG.
7 is a left side view of the surface precision polishing apparatus of the stop seal shown in FIG. 6 .
8 is a side view showing the structure of the shaft rotation support module constituting the surface precision polishing apparatus of the stop seal according to an embodiment of the present invention.
9 is a left side view of the axial rotation support module shown in FIG. 8 .
FIG. 10 is a plan view of the axial rotation support module shown in FIG. 8 .
11 is an excerpt of the main part of the surface precision polishing apparatus of the stop seal shown in FIG.
12 is a left side view of the surface precision polishing apparatus of the stop seal shown in FIG. 11 .
13 is a side view illustrating a structure of a shaft driving module constituting a surface precision polishing apparatus of a stop seal according to an embodiment of the present invention.
14 is a view for explaining the principle of operation of the stop seal spherical surface using the precision polishing apparatus for the surface of the stop seal according to an embodiment of the present invention.
15 is a flowchart illustrating a method for precision polishing the surface of a stop seal according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings to the extent that those of ordinary skill in the art to which the present invention pertains can easily practice the present invention.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to more clearly convey the gist of the present invention without obscuring the gist of the present invention by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numerals.

Also, device or element orientation (eg "front", "back", "up", "down", "top", "bottom") The expressions and predicates used herein with respect to terms such as ", "left", "right", "lateral", etc. are used merely to simplify the description of the invention, and the associated apparatus Or it will be appreciated that it does not simply indicate or imply that an element must have a particular orientation.

Hereinafter, the present invention will be described with reference to the drawings for explaining a surface precision polishing apparatus and a polishing method of a stop seal according to an embodiment of the present invention.

1 is a front view showing the structure of a surface precision polishing apparatus of a stop seal according to an embodiment of the present invention, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIG. It is an excerpt of the main part, FIG. 5 is an extract of the main part of FIG. 3, FIG. 6 is an extract of the main part of FIG. 4, FIG. 7 is a left side view of FIG. 6, and FIG. 8 is an axis rotation support module of the present invention. It is a side view, Fig. 9 is a left side view of Fig. 8, Fig. 10 is a plan view of Fig. 8, Fig. 11 is an excerpt of the main part of 1, Fig. 12 is a left side view of Fig. 11, and Fig. 13 is a reduction gear of the shaft drive module is a side view showing

1 to 13 , the stop seal surface precision polishing apparatus 100 according to an embodiment of the present invention has a damaged spherical surface on the surface of the stop seal 2 of the coolant pump shaft 1 of a nuclear reactor. As a device for precision grinding, the coolant pump shaft 1 is rotatably installed on the shaft rotation support module 110, connected to the shaft drive module 120 to rotate, and then the movement table 140 is moved to the X-axis direction and move the feed tool rest 180 in the Y-axis direction to move the cutting tool (eg, air grinder) to the machining surface of the stop seal 2 and fix the position, After moving the cutting tool 5 to the spherical radius position, the tool rest rotation module 150 and the feed tool rest 180 are moved to adjust the cutting depth of the cutting tool 5, and then the shaft driving module 120 The spherical surface damaged on the surface of the stop seal 2 by sequentially starting the cutting tool 5 and turning the knurling handle 151 of the tool rest rotation module 150 to adjust the cutting depth with the feed tool rest 180 while rotating. It may have a configuration for precision grinding.

Therefore, in the apparatus 100 for precision polishing the surface of the stop seal according to an embodiment of the present invention, it is difficult to process the spherical surface of the stop seal 2 into an accurate shape during conventional manual lapping, and it is performed during the planned preventive maintenance period of the nuclear power plant When the reactor coolant pump is maintained, processing time may be long and process delay may occur depending on the degree of damage to the surface of the stop seal (2). of the stop seal surface (spherical) at the maintenance site in the radiation area without taking out the coolant pump shaft (1) and the stop seal (2), which are highly polluted parts that are radioactively contaminated, out of the maintenance site. It has technical features in that it enables precise machining to suit the shape and surface roughness of the design requirements for the damaged part, and it can significantly reduce the machining cost because it replaces expensive precision CNC equipment.

1 to 3 , the stop seal surface precision polishing apparatus 100 according to an embodiment of the present invention supports the rotation of the base plate 10 and the coolant pump shaft 1 . A shaft rotation support module 110 for rotating the coolant pump shaft 1, a shaft driving module 120 for rotating the coolant pump shaft 1, the first LM guide 130 installed in the X-axis direction, and movably installed in the X-axis direction The moving table 140, the tool rest rotation module 150 rotatably installed, the lower support plate 160 fixedly installed on the upper part of the tool rest rotation module 150, and the second LM guide 170 installed in the Y direction. , a transfer tool rest 180 installed movably in the Y-axis direction, and a cutting tool clamp 190 installed on the transfer tool rest 180 to clamp the cutting tool 5. have.

Here, the X-axis direction refers to the longitudinal direction of the base plate 10 , and the Y-axis direction refers to the width direction of the base plate 10 . However, since the X-axis direction and the Y-axis direction are arbitrarily determined for convenience of description, they are not limited thereto.

Hereinafter, the configuration of the surface precision polishing apparatus 100 of the stop seal according to an embodiment of the present invention will be described in more detail.

First, the base plate 10 may be composed of a rectangular plate-shaped body on the bottom surface of the maintenance site. The base plate 10 is made of a rigid material such as steel to withstand the loads of the coolant pump shaft 1 and the stop seal 2 , and must have structural durability.

1 and 3 , the shaft rotation support module 110 is installed on the base plate 10 to support the rotation of the coolant pump shaft 1 .

Looking at the configuration of the shaft rotation support module 110 in detail, as shown in FIGS. 8 to 10 , the shaft rotation support module 110 is a side bracket ( 111), the bearing fixing bracket 112 fixed to the side bracket 111, the bearing fixing plate 113 supported by the bearing fixing bracket 112, and the bearing fixing plate 113, the coolant pump shaft (1) It includes a ball bearing 114 in contact with the outer peripheral surface of the. The ball bearing 114 is fixedly installed on the bearing fixing plate 113 by a stop ring 115 .

Since the ball bearing 114 rotatably supports the coolant pump shaft 1 while in contact with the outer peripheral surface of the coolant pump shaft 1 , eccentric rotation of the coolant pump shaft 1 can be prevented, and the shaft driving module 120 ), the coolant pump shaft 1 rotates smoothly even if the center is misaligned.

1 and 3 , the shaft driving module 120 is fixedly installed at one end of the upper side of the base plate 10 to rotate the coolant pump shaft 1 .

Looking at the configuration of the shaft driving module 120 in detail, as shown in FIGS. 11 to 13 , the shaft driving module 120 includes a fixing bracket 121 that is fixedly installed on the base plate 10 , and a fixing bracket 121 . The reducer 122 installed on the upper part of the , the shaft driving motor 123 connected to the reducer 122 and generating power, and the coolant pump that is detachably installed with a bolt (B) at one end of the coolant pump shaft (1) A shaft bracket 124, a shaft 125 installed concentrically with the coolant pump shaft 1 at the center of the coolant pump shaft bracket 124, and a shaft 125 to rotate the coolant pump shaft 1 and a coupling 126 connecting the reducer 122 to each other; and a bearing portion 127 for supporting the shaft 125 ; includes

The shaft drive module 120 does not move in the axial direction of the coolant pump shaft 1 when the coolant pump shaft 1 is installed on the shaft rotation support module 120, and the coolant pump shaft 1 moves to a ball bearing ( 127) may be configured to be tilted to be accurately seated.

Since the shaft rotation support module 120 rotatably supports the coolant pump shaft 1, even if the center of the shaft drive module 120 is misaligned, the coolant pump shaft 1 is configured to rotate, so that the stop Precise processing of the spherical surface of the seal 2 is possible.

That is, since the bearing part 127 of the shaft drive module 120 is installed in a self-aligning bearing structure, the center of the coolant pump shaft 1 and the shaft drive module 120 are separated due to the machining tolerance of the coolant pump shaft 1 . Even if the center (center) is slightly misaligned, the rotation of the coolant pump shaft 1 and run-out of the machining surface of the stop seal do not occur after fastening.

1, 3 to 5, the first LM guide 130 is fixedly installed in the X-axis direction of the base plate (10). This ‹š, the first LM guide 130 may be installed parallel to each other in the X-axis direction at a predetermined distance from each other on both sides of the upper surface of the base plate 10 . On the other hand, the LM guide of this embodiment is defined as a concept including all mechanical devices that smoothly move in the direction of the guide rail.

A first position fixing clamp 131 for fixing the moving position of the moving table 140 is installed in the first LM guide 130 . The first position fixing clamp 131 may be tightened to fix the position of the moving table 140 , or the moving table 140 may be moved by loosening the first position fixing clamp 131 .

1 to 5, the moving table 140 is installed movably in the X-axis direction of the base plate 10 along the first LM guide 130, and relatively more than the stop seal (2). installed high.

Looking at the structure of the moving table 140 , the moving table 140 is installed above the flange 141 and the flange 141 connected to the first LM guide 130 to move along the first LM guide 130 . and a leg 142 installed relatively higher than the stop seal 2 , and a flat plate 143 formed horizontally on the leg 142 to rotatably install the tool rest rotation module 150 .

The moving table 140 is installed to be movable in the X-axis direction of the base plate 10 along the first LM guide 130 , and is installed relatively higher than the stop seal 2 to prevent interference.

1, 2, and 4 to 7 , the tool rest rotation module 150 is rotatably installed on the upper portion of the moving table 140 . The tool rest rotation module 150 is a rotating structure and is installed to rotate with respect to the moving table 140 , thereby enabling the transfer tool rest 180 installed on the tool rest rotating module 150 to rotate 360 degrees.

A knurling handle 151 is installed on the side of the tool rest rotation module 150 to adjust the cutting depth of the cutting tool 10 while rotating the knurling handle 151 based on the tool rest rotation module 150. .

1 to 3 , the lower support plate 160 is fixedly installed on the top of the tool rest rotation module 150 . The lower support plate 160 is a plate-shaped structure for installing the transfer tool rest 180 thereon.

A second position fixing clamp 161 for fixing the moving position of the transfer tool rest 180 may be installed on a side surface of the lower support plate 160 . The second position fixing clamp 161 is tightened to fix the position of the transfer tool rest 180 , or the second position fixing clamp 161 is released to enable movement of the transfer tool rest 180 .

1, 2, 4 to 7, the second LM guide 170 is installed on the upper portion of the lower support plate 160 in the Y direction of the base plate 10. The second LM guide 170 may be installed parallel to each other in the Y direction at a predetermined distance from each other on both sides of the upper surface of the lower support plate 160 .

1, 2, 4 to 7, the transfer tool rest 180 is installed to be movable in the Y-axis direction of the base plate 10 along the second LM guide 170. At this time, the transfer tool rest 180 is a plate-shaped structure for installing the cutting tool clamp 190 for fixing the cutting tool 5 thereon.

1, 2 and 4 to 7 , the cutting tool clamp 190 is fixedly installed on the upper portion of the transfer tool rest 180 to clamp (fix) the cutting tool 5 .

The cutting tool 5 may use, for example, an air grinder, and the air grinder uses a high-precision and high-speed NSK ASTRO SerieS1612.

Looking at the structure of the cutting tool clamp 190 , the cutting tool clamp 190 includes a clamp circular post 191 formed on the upper portion of the transfer tool rest 180 , and a first connecting rod 192 coupled to the clamp circular post 191 . ), a second connecting rod 193 connected to the first connecting rod 192 , and a cutting tool holder 194 for holding the cutting tool 5 .

14 is a view for explaining the principle of operation of the stop seal spherical surface using the precision polishing apparatus for the surface of the stop seal according to an embodiment of the present invention.

As shown in FIG. 14 , the moving table 140 is moved in the X-axis direction (①) along the first LM guide 130 and the position is fixed, and the transfer tool rest 180 is moved along the second LM guide 170. ) is moved in the Y-axis direction (②) to contact the cutting tool (5) on the machining surface of the stop seal (2).

Then, with the tool rest rotation module 150 as the rotation center, the cutting tool 10 is moved in the diagonal direction (③) while turning the knurling handle 151 to adjust the cutting depth, and the cutting tool 5 is set to a spherical surface. While moving in the direction (④), the machining surface (R 155mm) of the stop seal (2) is precisely machined.

Hereinafter, a method of precisely polishing the surface of the stop seal according to an embodiment of the present invention will be described with reference to FIG. 15 .

15 is a flowchart illustrating a method for precision polishing the surface of a stop seal according to an embodiment of the present invention.

15 , in the method for precision polishing the surface of a stop seal according to an embodiment of the present invention, the first step of rotatably installing the coolant pump shaft 1 on the shaft rotation support module 110 ( S110 ) ); a second step (S120) of connecting the coolant pump shaft (1) to the shaft drive module (120); After moving the moving table 140 in the X-axis direction along the first LM guide 130 and fixing the position, and fixing the position by moving the feed tool rest 180 in the Y-axis direction along the second LM guide 170 , a third step of contacting the cutting tool 5 to the machining surface of the stop seal 2 (S130); a fourth step (S140) of driving the shaft driving module 120 to rotate the coolant pump shaft 1 and driving the cutting tool 5; and a fifth for processing the damaged spherical surface on the surface of the stop seal 2 while adjusting the cutting depth of the cutting tool 5 installed on the feed tool rest 180 by turning the knurling handle 151 of the tool rest rotation module 150 It may include a step (S150).

A detailed description of the surface precision polishing method of the stop seal according to an embodiment of the present invention is as follows.

First, in the first step ( S110 ), the coolant pump shaft 1 is rotatably installed on the shaft rotation support module 110 to process the damaged spherical surface on the surface of the stop seal 2 of the coolant pump shaft 1 . do.

At this time, the ball bearing 114 rotatably supports the coolant pump shaft 1 while in contact with the outer circumferential surface of the coolant pump shaft 1 , thereby preventing eccentric rotation of the coolant pump shaft 1 and driving the shaft. Even if the center of the module 120 is misaligned, the coolant pump shaft 1 rotates smoothly.

Also, in the second step ( S120 ), the coolant pump shaft 1 is connected to the shaft driving module 120 . That is, the coolant pump shaft bracket 124 is fastened to one end of the coolant pump shaft 1 with a bolt (B). Next, the shaft 125 is supported on the bearing part 127 , and the shaft 125 and the reducer 122 are connected to each other by a coupling 126 .

In addition, in the third step (S130), the moving table 140 is moved along the first LM guide 130 in the X-axis direction and the first position fixing clamp 131 is tightened to fix the position of the moving table 140. do. The transfer tool rest 180 is moved along the second LM guide 170 in the Y-axis direction and the second position fixing clamp 161 is tightened to fix the position of the transfer tool rest 180 . Then, the cutting tool 5 is moved to a position to be machined using the tool rest rotation module 150 and the knurling handle 151, and at this time, the cutting tool 5 is brought into contact with the machining surface of the stop seal 2 .

In addition, in the fourth step ( S140 ), the shaft driving module 120 is driven to rotate the coolant pump shaft 1 and drive the cutting tool 5 . The power of the shaft driving motor 123 is decelerated by the speed reducer 122 and then transmitted to the shaft 125 to rotate the shaft 125 to rotate the coolant pump shaft 1 . And the air grinder which is the cutting tool 5 rotates.

Finally, in the fifth step (S150), the stop seal (2) while adjusting the cutting depth of the cutting tool (5) installed on the transfer tool rest (180) by turning the knurling handle (151) of the tool rest rotation module (150) Precision machining of the damaged spherical surface on the surface of

That is, after bringing the cutting tool 5 into contact with the damaged surface of the stop seal 2 , the cutting depth is adjusted, and the knurling handle 151 is rotated to rotate the tool rest rotation module 150 to remove the stop seal 2 . to machine the spherical surface. At this time, the surface of the convex spherical shape of the stop seal 2 with a radius of 155 mm is processed using a grinding wheel, a diamond lapping wheel, or a diamond lapping film according to the degree of surface damage of the stop seal 2 .

In addition, the surface damaged portion of the stop seal 2 is processed while adjusting the depth of cut and changing the grain size of the diamond lapping wheel according to the degree of processing. In order to satisfy the final surface finish, the grinding wheel, diamond lapping wheel, or diamond lapping film should be processed in order.

As described above, the apparatus and method for precision polishing the surface of a stop seal according to an embodiment of the present invention can improve the maintenance quality by spherical processing of the stop seal into a precisely designed spherical shape, so that the stop of the conventional nuclear reactor coolant pump Since the seal is manually wrapped every time the pump is disassembled and maintained, the problem that the spherical surface of the stop seal cannot be processed into an accurate shape can be solved.

In addition, the surface precision polishing apparatus and polishing method of the stop seal according to an embodiment of the present invention can complete the damaged surface processing of the stop seal within a short period of time, greatly reducing input manpower, and machining surface precision It is possible to improve the quality of maintenance by improving

On the other hand, in the present specification and drawings, preferred embodiments of the present invention have been disclosed, and although specific terms are used, these are only used in a general sense to easily explain the technical contents of the present invention and help the understanding of the present invention, It is not intended to limit the scope of the invention. It is apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

<Explanation of symbols for main parts of the drawing>
100: surface precision grinding device of the stop seal
1: Coolant pump shaft 2: Stop seal
5: Cutting tool 10: Base plate
110: shaft rotation support module 111: side bracket
112: bearing fixing bracket 113: bearing fixing plate
114: ball bearing 115: retaining ring
120: shaft drive module 121: fixing bracket
122: reducer 123: shaft drive motor
124: coolant pump shaft bracket 125: shaft
126: coupling 127: bearing part
130: first LM guide 131: first position fixing clamp
140: moving table 141: flange
142: leg 143: reputation
150: tool rest rotation module 160: lower support plate
161: second position fixing clamp 170: second LM guide
180: feed tool rest 190: cutting tool clamp
191: clamp circular support 192: first connecting rod
193: second connecting rod 194: cutting tool holder
B: bolt

Claims (10)

An apparatus for precision polishing the surface of a stop seal for processing a damaged spherical surface on the surface of the stop seal of a coolant pump shaft of a nuclear reactor,
a base plate installed on the floor;
a shaft rotation support module installed on the base plate to support rotation of the coolant pump shaft;
a shaft driving module installed at an upper end of the base plate to rotate the coolant pump shaft;
a first LM guide installed in the X-axis direction of the base plate;
a moving table installed movably in the X-axis direction of the base plate along the first LM guide and installed relatively higher than the stop seal;
a tool rest rotation module rotatably installed on the upper portion of the moving table;
a lower support plate fixedly installed on the top of the tool rest rotation module;
a second LM guide installed on the upper part of the lower support plate in the Y direction of the base plate;
a transfer tool rest installed movably in the Y-axis direction of the base plate along the second LM guide; and
Surface precision grinding apparatus of a stop seal, characterized in that it comprises a cutting tool clamp installed on the upper portion of the feed tool rest to clamp the cutting tool. The method of claim 1,
The shaft rotation support module is
side brackets installed on the upper surface of the base plate at a predetermined distance from each other;
a bearing fixing bracket fixed to the side bracket;
a bearing fixing plate supported by the bearing fixing bracket; and
and a ball bearing installed on the bearing fixing plate and in contact with an outer circumferential surface of the coolant pump shaft. The method of claim 1,
The shaft drive module is
a fixing bracket fixedly installed to the base plate;
a reducer installed on the upper part of the fixing bracket;
a shaft drive motor connected to the reduction gear and generating power;
a coolant pump shaft bracket detachably installed with a bolt at one end of the coolant pump shaft;
a shaft installed concentrically with the coolant pump shaft at the center of the coolant pump shaft bracket;
a coupling connecting the shaft and the reducer to each other to rotate the coolant pump shaft; and
The stop seal surface precision grinding device, characterized in that it comprises a bearing for supporting the shaft. The method of claim 1,
The tool rest rotation module is a stop seal surface precision grinding device, characterized in that the knurling handle is installed on the side. The method of claim 1,
The first LM guide is provided with a first position fixing clamp for fixing the moving position of the moving table,
The lower support plate is a stop seal surface precision grinding device, characterized in that a second position fixing clamp for fixing the moving position of the transfer tool rest is installed. The method of claim 1,
The moving table is
a flange connected to the first LM guide to move along the first LM guide;
a leg installed above the flange and installed relatively higher than the stop seal; and
The stop seal surface precision polishing apparatus, characterized in that it is formed horizontally on the leg and consists of a flat plate on which the tool rest rotation module is rotatably installed. The method of claim 1,
The shaft rotation support module,
The stop seal surface precision polishing apparatus according to claim 1, wherein the coolant pump shaft is supported so that the coolant pump shaft can be rotated even if the center of the shaft drive module is misaligned. A method for precision polishing the surface of a stop seal using a precision polishing device for the surface of the stop seal for processing a damaged spherical surface on the surface of the stop seal of a coolant pump shaft of a nuclear reactor,
The stop seal surface precision polishing device,
a base plate installed on the floor;
a shaft rotation support module installed on the base plate to support rotation of the coolant pump shaft;
a shaft driving module installed at an upper end of the base plate to rotate the coolant pump shaft;
a first LM guide installed in the X-axis direction of the base plate;
a moving table installed movably in the X-axis direction of the base plate along the first LM guide and installed relatively higher than the stop seal;
a tool rest rotation module rotatably installed on the upper portion of the moving table;
a lower support plate fixedly installed on the top of the tool rest rotation module;
a second LM guide installed on the upper part of the lower support plate in the Y direction of the base plate;
a transfer tool rest installed movably in the Y-axis direction of the base plate along the second LM guide; and
and a cutting tool clamp installed on the upper part of the feed tool rest to clamp the cutting tool,
The method of precision polishing the surface of the stop seal,
a first step of rotatably installing the coolant pump shaft on the shaft rotation support module;
a second step of connecting the coolant pump shaft to the shaft drive module;
After moving the moving table in the X-axis direction along the first LM guide and fixing the position, and moving the transfer tool rest in the Y-axis direction along the second LM guide to fix the position, a third step of contacting the cutting tool;
a fourth step of driving the shaft driving module to rotate the coolant pump shaft and driving the cutting tool; and
and a fifth step of machining the damaged spherical surface on the surface of the stop seal while adjusting the cutting depth of the cutting tool installed on the transfer tool rest by turning the knurling handle of the tool rest rotation module. 9. The method of claim 8,
The fifth step is
A method for precision polishing the surface of a stop seal, characterized in that the convex spherical surface of the stop seal is processed using any one of a grinding wheel, a diamond lapping wheel, or a diamond lapping film according to the degree of surface damage of the stop seal. 10. The method of claim 9,
The fifth step is
A method for precision polishing the surface of a stop seal, characterized in that the machining process is performed in the order of the grinding wheel, the diamond lapping wheel, or the diamond lapping film to satisfy the final surface roughness.

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